condition mean min max ZT0-3 21.82715 21.82715 21.82715 ZT4-7 34.6229 34.6229 34.6229 ZT8-11 18.26545 18.26545 18.26545 ZT12-15 6.76706 6.76706 6.76706 ZT16-19 10.8884 10.8884 10.8884 ZT20-23 14.9561 14.9561 14.9561